Remove dialogue tone-of-voice system, add Gitea Actions full build, add venue cycling

- Delete Rules.Tone/TONE_NAMES, NpcProfile.tone_modifiers, tone params on
  NPCController.roll_reaction/apply_player_action; dialogue_lines flattened
  to Array[String]; HUD tone label, T binding, and hud.tone_prefix removed
- Docs updated everywhere (PLAN, README, DONE, MEMORY); PLAN section heading
  'Tone and Design Direction' -> 'Design Direction'
- Add .gitea/workflows/build.yml: checks job (import+tests) on push/PR; full
  build job (export templates, Linux/Windows/macOS exports, artifact upload,
  and tag-based Gitea release publish via GITEA_TOKEN) on tags/dispatch
- Remove old .github/workflows/ci.yml to avoid double runs
- Add venue cycling (V) across all three scenarios with hud.venue_switched
- Refresh README screenshots to match the new HUD
- 53/53 tests pass, boot smoke clean

src/game/ui/hud.gd

@@ -20,7 +20,6 @@ var mode_label: Label
 var wand_panel: PanelContainer
 var wand_text: Label
 var wand_meta: Label
-var tone_label: Label
 var escalation_label: Label
 
 var _debug_enabled := false
@@ -99,13 +98,6 @@ func _init() -> void:
 	mode_label.modulate = Color(0.85, 0.85, 0.9)
 	vbox.add_child(mode_label)
 
-	# --- dialogue tone indicator ---
-	tone_label = Label.new()
-	tone_label.text = "Tone: Professional"
-	tone_label.add_theme_font_size_override("font_size", 13)
-	tone_label.modulate = Color(0.7, 0.85, 1.0)
-	vbox.add_child(tone_label)
-
 	# --- escalation level indicator (color-coded) ---
 	escalation_label = Label.new()
 	escalation_label.text = "Escalation: Observation"
@@ -200,8 +192,7 @@ func _refresh_mode_label() -> void:
 func set_action_hint(text: String) -> void:
 	hint_label.text = text
 
-func set_tone(tone_name: String) -> void:
-	tone_label.text = Strings.fmt("hud.tone_prefix", [tone_name])
+
 
 ## Color-coded escalation feedback (PLAN.md: Polish and Accessibility).
 ## Green → yellow → orange → red as the escalation level rises.